What Do All Of The Numbers Mean When Buying A Bowling Ball - BowlersMart - The Most Trusted Name in Bowling (2024)

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RADIUS OF GYRATION (RG): BEFORE DRILLING

HIGH RG:2.57-2.60

MEDIUM RG: 2.54-2.56

LOW RG: 2.54 AND LOWER

Higher the RG numbers will tell us that the bowling balls mass is concentrated more towards the cover, so we tend to use the term “cover heavy”, and in return means the bowling ball has length through the heads(front part of the lane).

Lower the RG numbers tell us the opposite and the bowling balls mass is concentrated to the mass of the core or “core heavy”, which means the bowling ball will tend to see the front part of the lane. So in layman’s terms, it will transition earlier.

DIFFERENTIAL:(Diff):

HIGH DIFF: .050-HIGHER

MEDIUM DIFF:.049-.040

LOW DIFF:.039-LOWER

The differential is defined as the difference between the maximum and minimum RG. So the DIFFERENTIAL tells us the bowling balls flare potential (or overall hook). This measurement determines the flare potential as a rating of high, medium, low.

Sometimes there is another number on the shelf talker and is referred to as the INTERMEDIATE DIFF; (Located on your asymmetrical bowling balls) This is the difference between the (Y) AXIS and (Z) AXIS (intermediate diff) So the higher the INTERMEDIATE DIFF the stronger the bowling balls PSA (preferred spin axis) or mass bias is.

Key factor here is these are only reference numbers and before drilling, and as soon as the balls are drilled these numbers can increase or decrease. Well i hope you learned and now have a better understanding about the numbers.

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